USAP-DC

This project examines the role of glacier dynamics in glacial sediment yields. The results will shed light on how glacial erosion influences both orogenic processes and produces sediments that accumulate in basins, rich archives of climate variability. Our hypothesis is that erosion rates are a function of sliding speed, and should diminish sharply as the glacier's basal temperatures drop below the melting point. To test this hypothesis, we will determine sediment accumulation rates from seismic studies of fjord sediments for six tidewater glaciers that range from fast-moving temperate glaciers in Patagonia to slow-moving polar glaciers on the Antarctic Peninsula. Two key themes are addressed for each glacier system: 1) sediment yields and erosion rates by determining accumulation rates within the fjords using seismic profiles and core data, and 2) dynamic properties and basin characteristics of each glacier in order to seek an empirical relationship between glacial erosion rates and ice dynamics. The work is based in Patagonia and the Antarctic Peninsula, ideal natural laboratories for these purposes because the large latitudinal range provides a large range of precipitation and thermal regimes over relatively homogeneous lithologies and tectonic settings. Prior studies of these regions noted significant decreases in glaciomarine sediment accumulations in the fjords to the south. As well, the fjords constitute accessible and nearly perfect natural sediment traps.

The broader impacts of this study include inter-disciplinary collaboration with Chilean glaciologists and marine geologists, support for one postdoctoral and three doctoral students, inclusion of undergraduates in research, and outreach to under-represented groups in Earth sciences and K-12 educators. The results of the project will also contribute to a better understanding of the linkages between climate and evolution of all high mountain ranges.

Person	Role
Anderson, John	Investigator
Hallet, Bernard	Investigator
Wellner, Julia	Co-Investigator

Antarctic Earth Sciences	Award # 0338371
Antarctic Earth Sciences	Award # 0338137

NBP0505
NBP0703

Deployment	Type
NBP0505	ship expedition
NBP0703	ship expedition

None in the Database

Repository	Title (link)	Format(s)	Status
R2R	Expedition data of NBP0703	None	exists
USAP-DC	NBP0505 sediment core locations	None	exists
USAP-DC	NBP0505 CTD data	None	exists
R2R	Expedition data of NBP0505	None	exists

1. Majewski, W., Wellner, J. S., Szczuciński, W., & Anderson, J. B. (2012). Holocene oceanographic and glacial changes recorded in Maxwell Bay, West Antarctica. Marine Geology, 326-328, 67–79. (doi:10.1016/j.margeo.2012.08.009)
2. Jaeger, J. M., & Koppes, M. N. (2016). The role of the cryosphere in source-to-sink systems. Earth-Science Reviews, 153, 43–76. (doi:10.1016/j.earscirev.2015.09.011)